The latest TIME magazine (p23) has an interesting use of the word. The Secretary of the
Treasury has been criticized tor being too outspoken.
"It's not that he's bad, and not that he's dumb," says a New York banker who attended a
meeting with O'Neill last week. "It's just that he has no gravitas And once you
lose it, you can't get it back."

The meaning is clear enough. But let's hear some suggestion as to other ways of saying it. I
think it may be hard to improve on.

Edit: My dictionary definition is:
gravitas - a certain reserved dignity; propriety and good taste in behavior and speech, as of a leader or official